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BM1P064FJ-E2 Datasheet(PDF) 10 Page - Rohm |
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BM1P064FJ-E2 Datasheet(HTML) 10 Page - Rohm |
10 / 30 page 10/26 Datasheet Datasheet BM1P068FJ TSZ02201-0F2F0A200190-1-2 24.Oct.2013.Rev.001 © 2013 ROHM Co., Ltd. All rights reserved. www.rohm.com TSZ22111・15・001 A: Voltage is applied to the VH pin (pin 8) and voltage at the VCC pin (pin 6) starts to rise. B: When VCC pin (pin 6) voltage > VUVLO1, the VCC UVLO function is canceled and the DC/DC operation starts. Then VCC start-up circuit stops charging. C: When VCC pin (pin 6) voltage < VUVLO2, the VCC UVLO function is operated and the DC/DC operation stops. Then VCC start-up circuit starts charging. D: When VCC pin (pin 6) voltage > VUVLO1, the VCC UVLO function is canceled and the DC/DC operation starts. Then VCC start-up circuit stops charging. E: After finishing start-up, VCC pin voltage is stable as secondary output voltage is stable. F: VCC pin voltage rises G: When VCC pin (pin 6) voltage > VOVP1, IC starts to detect VCCOVP. H: When the status of VCC pin voltage > VOVP1 continues for TLATCH (typ = 100us), switching operation is stopped by the VCC OVP function. Then IC stops by latch operation, and internal latch signal changes from L to H. I: When VCC pin voltage < VUVLO2, VCC UVLO function operates, and IC consumption current falls down. J: When VCC pin (pin 6) voltage > VUVLO1, the VCC UVLO function is released, but the switching does not operate. K: The same as I. L: The same as J. M: The same as K. N: High voltage line VH is reduced. Then VCC pin voltage drops because IC cannot charge the power to VCC pin. O: When VCC < VLATCH, the VCC latch is released. P: When VCC > VUVLO, start-up circuit stops, and the switching operation re-starts. ・Capacitance value of VCC pin To ensure stable operation of the IC, set the VCC pin capacitance value to 10 uF or above. If the capacitor for the VCC pin is too large, it will delay the response of the VCC pin to secondary output. In cases where the transformer has a low degree of coupling, a large surge can be generated at the VCC pin, which may damage the IC. In such cases, insert a resistance of 10 Ω to 100 Ω on a bus between the diode and capacitor after the auxiliary winding. As for constants, perform a waveform evaluation of the VCC pin and enter settings that will prevent any surge at the VCC pin from exceeding the absolute maximum rating for the VCC pin. ・VCC OVP voltage protection settings for increased secondary output The VCC pin voltage is determined by the secondary output and the transformer ratio (Np:Ns). Accordingly, when secondary output has become large, it can be protected by VCC OVP. The VCC OVP protection settings are as follows. Np Nb Ns Vout Figure 12 VCC OVP Settings This is determined by VCC voltage = Vout x Nb/Ns. (Vout: Secondary output, Nb: auxiliary winding turns, Ns: secondary winding turns). When secondary output voltage rises 30% high, and protection is desired, set the number of winding turns so that 1.3 x Vout x (Nb/Ns) > VOVP1. For VCC OVP protection, since there is the TLATCH (typ = 100 us) blanking time, VCC OVP protection cannot be detected for instantaneous surges at the VCC pin. However, VCC OVP is detected when the VCC pin voltage has become higher than VOVP1 for at least the TLATCH period, such as due to the impact of a low degree of transformer couplings, so an application evaluation should be done to check this before setting VCC OVP. |
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